[1] These related bends differ by the way the two constituent overhand knots are interlocked.

[5][6] In the 1930s, Ashley performed security tests on a number of bends for the Collins and Aikman company.

[7] The manufacturer wanted a bend that would not slip when tied in mohair, a stiff slippery material.

The jerk testing Ashley performed placed his bend, #1452, equal to the barrel knot in exhibiting no slippage at all.

As the two working ends emerge from the knot, they make a sort of vortex that twists the tails in one direction; the tails can be oriented such that they are twisted ever tighter together, or put on the other side of each other in which case the setting of the knot can lead to a jamming state.